JPS6233812B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital protective relay device configured with a microcomputer or a minicomputer, and in particular, it is similar to the setting procedure of the setting device of the device and increases the hardware and program capacity. Concerning a reliable method of inspecting a setting device. Digital protective relay devices for small computers used in power systems can have multiple relay functions, so there are many setting value inputs such as various constants that determine operating levels and characteristics. It is necessary to prevent setting errors. In addition, inside the processing device of the relay device, 2
Processing is done in decimal numbers, but when setting, it is necessary to use decimal numbers for ease of handling. Furthermore, it is necessary to protect the set value in the event of a power failure, to check the set value when it is set, and to check for fluctuations in the set value due to external factors. A conventional digital protective relay device is generally configured as shown in Fig. 1, which takes in analog current and voltage data from the power system, converts it into digital data using an analog-digital converter 1, and sends it to a protection processing device. 4 and a microprocessor 41 within the device 4.
is used to perform arithmetic processing on the input digital data and the set value stored in advance in the set value memory 42, and as a result, when there is an accident in the system, this system fault is detected and the circuit is disconnected. Sends out protection outputs such as trip commands. The setting value in such a relay device is set as follows. That is, a decimal setting value is set by the operator to the setting devices 21 to 2n (digital switches) having the required number of lines in the setting device 3, and the setting command device 2
P's setting start command causes the setting value to be stored in the corresponding address of the internal memory 32 of the setting processing section 30. Thereafter, the n types of decimal set values are sequentially sent to the binary coding section 31 and converted into binary numbers, and then transferred and stored in the set value memory 42 of the protection processing device 4. Another power outage occurred,
Even if the set value in the memory element is lost, the set set value is mechanically held in the setters 21 to 2n, so the normal set value can be retransmitted after power is restored.

Setting is possible with the above configuration, but it has disadvantages such as requiring a setter for each type of setting value, which prevents miniaturization, and the large number of mechanical contacts easily causing contact failure. Ta.

Therefore, the present inventor has already proposed a compact and highly reliable setting device that eliminates the above-mentioned drawbacks. That is, in the previously proposed digital protective relay device shown in Fig. 2, only one type of setting device 21 is provided instead of providing many types of setting devices, and a selection switch 2R is separately provided for selecting the type of setting value, and the setting process is The internal memory 32 of the unit 30 employs a semiconductor non-volatile memory. First, the setting command device 2P sends a setting start command to the setting processing section 30, and then the setting value is set in decimal form by the setting device 21. Furthermore, the desired setting value type is selected by the selection switch 2R, and the selection signal is sent. It is sent to the setting processing section 30. The setting processing section 30 decodes the selection signal, specifies the address of the internal memory 32, and writes the decimal setting value to the non-volatile generation memory 32 using a write signal. Thereafter, the setting value stored in the nonvolatile memory 32 is read out to the setting check section 33, and it is checked whether it is within the setting value range for each setting value type stored in advance in the memory in the same section. .
If it is not within the range, a warning will be given that there is a setting error or selection error in the setting value, and if incorrect setting is confirmed, the setting will be redone. When correct setting is confirmed, move on to the next setting operation. By such means, the possibility of erroneous setting is extremely reduced and highly reliable setting is made possible. Setting is completed correctly,
The setting end signal of the setting command device 2P is sent to the setting processing unit 30.
When the setting processing unit 30 sends the data to the nonvolatile memory 32
The decimal setting value stored in is read out to the binary coding unit 31, converted into a binary setting value, and sequentially transferred and stored in the setting value memory 42 of the protection processing device 4. Incidentally, changes in the setting value in the non-volatile generation memory 32 due to noise or environmental changes can be detected by periodic checks in the setting check section 33.

The above-mentioned configuration makes it possible to set many types of set values with a single set of setters, and the use of non-volatile memory prevents the set values from being lost due to power outages. It has excellent effects such as preventing incorrect settings and detecting fluctuations in stored setting values through periodic checks.
Miniaturization and high reliability have been achieved.

As described above, the reliability of the setting value in the setting processing unit 30 is maintained at a high level, but the reliability of the setting value used for processing calculations in the protection processing unit 4 is also maintained at a higher level. There is a need to.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for checking a set value to improve the reliability of the set value without significantly increasing the amount of programs or hardware.

FIG. 3 shows a configuration diagram of an embodiment of the present invention,
The method of inspecting the setting device will be explained below with reference to FIG. In FIG. 3, the same symbols as those in FIG. 2 indicate the same or equivalent items, 43 is a save memory, and 5 is a monitoring device for inspection. When inspecting the setting device configured as described above, first, an inspection command is sent from the monitoring device 5 to the setting device 3 and the protection processing device 4. Upon receiving the inspection command, the protection processing device 4 interrupts the protection processing operation and transfers the currently used setting value from the setting value memory 42 to the save memory 43. Next, the setting device 3 sends the decimal setting value stored in the non-volatile generation memory 32 in the device to the binary code section 31, similar to the operation during setting, and
After performing decimal-binary conversion, it is transferred and stored in the set value memory 42 in the protection processing device 4. After a certain period of time has elapsed, the protection processing device 4 checks whether the setting value transferred from the setting device 3 is stored in the setting value memory 42, and if the setting value is not stored, it is determined that the setting device 3 is abnormal. If there is, a setting device failure signal is sent to the monitoring device 5. If the setting value is stored in the setting value memory 42, the setting value in the setting value memory 42 is compared with the setting value in the save memory 43, and if they do not match, a setting device failure signal is sent as a setting value failure. It is sent to the monitoring device 5. The inspection ends when there are no discrepancies for all set values. Monitoring device 5
shall issue an alarm output to notify an abnormality only when it receives a setting device failure signal. As above,
The inspection operation of the settling device in the present invention is completely the same as a part of the processing operation during settling, and since it uses a microprocessor, there is no need to add special hardware for inspection, and a few inspection programs are required. Furthermore, not only defects in the setting device but also defects in the setting value can be detected at once.

Generally, when using non-volatile memory, it is necessary to ensure reliability by activating it at regular intervals. Therefore, a counter 34 for counting the number of inspection commands is provided in the setting processing section 30, and each time the counter 34 counts a predetermined value, the setting processing section 30
sends an activation signal to the nonvolatile memory 32 of
It is designed to be activated automatically and periodically.

As described above, the method for inspecting the setting device of a digital protective relay device according to the present invention uses an inspection command from a monitoring device to activate the nonvolatile memory, and also interrupts the protection processing operation by the inspection command. The setting value currently in use is temporarily saved in the protection processing section, and the setting value stored in the memory in the setting processing section is led to the protection processing section, and compared with the saved setting value. This is a method of checking for defects, and its inspection operation is almost the same as the settling operation. Therefore, it does not require the addition of special hardware and only requires a few programs, so it does not increase the configuration and improves reliability. It is possible to measure the improvement in

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a conventional digital protective relay device, FIG. 2 is a configuration diagram of a digital protective relay device for explanation, and FIG. 3 is a configuration diagram showing an embodiment of the present invention. 1 is an analog-digital converter, 21 to 2n
is a setting device, 2P is a setting command device, 2R is a selection switch, 3 is a setting device, 30 is a setting processing section, 31 is a 2
Evolution code section, 32 internal memory, 33 set value check section, 34 counter, 4 protection processing device, 4
1 is a microprocessor, 42 is a setting value memory,
43 is a backup memory, and 5 is a monitoring device.

Claims (1)

[Claims] 1. A setting device having a non-volatile memory for storing a setting value selected by a selection switch, and a setting device that outputs a setting value from this setting device to a setting value memory of a protection processing device; In a digital protective relay device that performs protection calculations based on data and set values input in a protection processing device,
A backup memory is provided in the protection processing device, and a monitoring device is provided for monitoring the protection processing device and the settling device, and when an inspection command is issued to the monitoring device, the protection processing operation of the protection processing device is interrupted. Then, the setting value stored in the setting value memory in the device is saved in the save memory, and then the setting device sends the setting value stored in the nonvolatile memory of the device to the protection processing device, and the setting value is sent to the protection processing device. A method for inspecting a setting device, characterized in that the setting value is stored in a setting value memory, and compared with a setting value in a save memory, and if there is a mismatch, a setting device failure signal is sent to a monitoring device. 2. The method for inspecting a settling device according to claim 1, wherein a non-volatile memory in the settling device is activated every time the inspection command is issued a predetermined number of times.